fix(linux): Explicitly initialize GTK

[ermshiperete]

Usually this is done automatically. However, if e.g. no DISPLAY variable is set it'll fail. When we explicitly initialize GTK it still fails, but shows a more helpful warning instead of throwing a runtime error.

Fixes #9705.

User Testing

Preparations

• The test should be run on any Linux platform with X11:

• Install build artifacts of this PR

• Reboot

Tests

TEST_WARNING: if DISPLAY is not set we should get a warning instead of a runtime error

• in a terminal window, run unset DISPLAY
• in the same terminal, start Keyman Configuration by typing km-config
• Verify that instead of opening the Keyman Configuration window the terminal displays a warning similar to Gtk-WARNING **: 16:51:19.867: cannot open display:. There should be no lines containing the text RuntimeError.

[keymanapp-test-bot]

User Test Results

Test specification and instructions

• ✅ TEST_WARNING (PASSED): Retested as per eberhard's new instructions in Ubuntu Lunar Linux OS (VM) and here is my observation: 1. Tested this in Ubuntu on Xorg (X11) Lunar Linux OS. 2. Verified that instead of opening keyman configuration dialog it shows an error message on the terminal window. 3. Also, verified that it does not show 'Runtime error' in the terminal window. Seems to be working as expected. (notes)

Test Artifacts

• Linux
  • Keyman for Linux

[bharanidharanj]

Test Results

• TEST_WARNING (FAILED): Tested with the attached PR build (keyman 17.0.187-alpha-local (package version 17.0.187-1~PR-9706-1427.1+lunar1) in Lunar 23.04 Linux OS and here is my observation: 1. Run the above mentioned commands in the terminal window. Noticed that it opens the Keyman Configuration window on the screen. 2. The expected result is not displayed on the terminal. Seems to be an issue.

  

[ermshiperete]

@bharanidharanj I tried and it works for me on Lunar. Can you please try again? And if it fails again run dpkg -l keyman in the terminal. Also, run echo $DISPLAY and try to start Firefox (firefox in the terminal). Thanks!

@keymanapp-test-bot retest

[bharanidharanj]

Test Results

• TEST_WARNING (FAILED): Retested as per your suggestion in Lunar Linux OS and here is my observation: 1. I run the commands in the terminal window as per your instructions. 2. Still, I am seeing the Keyman Configuration window open after running the km-config command in the terminal window. Please, let me know If I missed anything in this test.

..Keyman Configuration window still opens

[ermshiperete]

ok, so the problem is that DISPLAY is still set (echo $DISPLAY should output an empty line). Does DISPLAY= km-config give the desired results (i.e. DISPLAY= followed by km-config in the same line)?

@keymanapp-test-bot retest

[ermshiperete]

Test failed because of incomplete test instructions. It can't be tested with Wayland but has to be tested with X11.

[bharanidharanj]

Test Results

• TEST_WARNING (PASSED): Retested as per eberhard's new instructions in Ubuntu Lunar Linux OS (VM) and here is my observation: 1. Tested this in Ubuntu on Xorg (X11) Lunar Linux OS. 2. Verified that instead of opening keyman configuration dialog it shows an error message on the terminal window. 3. Also, verified that it does not show 'Runtime error' in the terminal window. Seems to be working as expected.

..Warning Message in Terminal Window

[keyman-server]

Changes in this pull request will be available for download in Keyman version 17.0.187-alpha